akkoma/lib/pleroma/web/activity_pub/mrf/reject_non_public.ex

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defmodule Pleroma.Web.ActivityPub.MRF.RejectNonPublic do
alias Pleroma.User
@behaviour Pleroma.Web.ActivityPub.MRF
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@impl true
def filter(object) do
if object["type"] == "Create" do
user = User.get_by_ap_id(object["actor"])
public = "https://www.w3.org/ns/activitystreams#Public"
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# Determine visibility
visibility =
cond do
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public in object["to"] -> "public"
public in object["cc"] -> "unlisted"
user.follower_address in object["to"] -> "followers"
true -> "direct"
end
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{flag, object_out} =
case visibility do
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"public" -> {:ok, object}
"unlisted" -> {:ok, object}
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_ -> {:reject, nil}
end
{flag, object_out}
else
{:ok, object}
end
end
end